64764281 has 4 divisors (see below), whose sum is σ = 65432052. Its totient is φ = 64096512.

The previous prime is 64764269. The next prime is 64764289. The reversal of 64764281 is 18246746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16933225 + 47831056 = 4115^2 + 6916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64764281 is a prime.

It is a super-2 number, since 2×64764281² = 8388824186893922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64764289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333740 + ... + 333933.

It is an arithmetic number, because the mean of its divisors is an integer number (16358013).

Almost surely, 2^64764281 is an apocalyptic number.

It is an amenable number.

64764281 is a deficient number, since it is larger than the sum of its proper divisors (667771).

64764281 is an equidigital number, since it uses as much as digits as its factorization.

64764281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667770.

The product of its digits is 64512, while the sum is 38.

The square root of 64764281 is about 8047.6257989546. The cubic root of 64764281 is about 401.5859556346.

The spelling of 64764281 in words is "sixty-four million, seven hundred sixty-four thousand, two hundred eighty-one".